Any of the long feathers growing backwards from the saddle of a domestic fowl, especially a cock (more fully "saddle hackle feather"); these feathers collectively.
Origin
Mid 19th century.
Definition of saddle hackle in US English:
saddle hackle
noun
Any of the long feathers growing backwards from the saddle of a domestic fowl, especially a cock (more fully "saddle hackle feather"); these feathers collectively.